MFC r285643:
When checking for the valid value of the frame pointer, verify that it
belongs to the kernel stack address range for the thread.

MFC r285041:
Use single instance of the identical INKERNEL() and PMC_IN_KERNEL()
macros on amd64 and i386. On i386, correct the lowest kernel address.

MFC r280834:
Bound the number of frames traversed when executing the ustackdepth action.

MFC r267759, r267761

r267759:
Fix a couple of bugs on amd64 when fetching probe arguments beyond the
first five for probes entered through a UD fault (i.e. FBT probes).

Specifically, handle the fact that dtrace_invop_callsite must be
16 byte-aligned and thus may not immediately follow the call to
dtrace_invop() in dtrace_invop_start(). Also fetch register arguments and
the stack pointer through a struct trapframe instead of a struct reg.

r267761:
Fix some bugs when fetching probe arguments in i386. Firstly ensure that
the 4 byte-aligned dtrace_invop_callsite can be found and that it
immediately follows the call to dtrace_invop(). Secondly, fix some pointer
arithmetic to account for differences between struct i386_frame and illumos'
struct frame. Finally, ensure that dtrace_getarg() isn't inlined. It works
by following a fixed number of frame pointers to the probe site, so inlining
breaks it.

PR: 191260

MFC r285643:
When checking for the valid value of the frame pointer, verify that it
belongs to the kernel stack address range for the thread.

MFC r285041:
Use single instance of the identical INKERNEL() and PMC_IN_KERNEL()
macros on amd64 and i386. On i386, correct the lowest kernel address.

MFC r280834:
Bound the number of frames traversed when executing the ustackdepth action.

MFC r267759, r267761

r267759:
Fix a couple of bugs on amd64 when fetching probe arguments beyond the
first five for probes entered through a UD fault (i.e. FBT probes).

Specifically, handle the fact that dtrace_invop_callsite must be
16 byte-aligned and thus may not immediately follow the call to
dtrace_invop() in dtrace_invop_start(). Also fetch register arguments and
the stack pointer through a struct trapframe instead of a struct reg.

r267761:
Fix some bugs when fetching probe arguments in i386. Firstly ensure that
the 4 byte-aligned dtrace_invop_callsite can be found and that it
immediately follows the call to dtrace_invop(). Secondly, fix some pointer
arithmetic to account for differences between struct i386_frame and illumos'
struct frame. Finally, ensure that dtrace_getarg() isn't inlined. It works
by following a fixed number of frame pointers to the probe site, so inlining
breaks it.

PR: 191260